Here are fours spare Buller / Cordeaux style units that I picked up in a large batch years ago. Other pieces in the batch were Australian used, so I expect these were British or other made for Aussie / New Zealand use. Selling all four pieces as a set for $18. Email with questions or offers. Left to right:

U-1154 marked as "R.F. Ltd" on top of dome

U-1540 incuse marking I can hardly read, see a 'Z' for NZ perhaps

U-1145 (or perhaps U-1148) - no markings

U-1154 also marked as "R.F. Ltd" (almost the same color as the far left RF piece, the white little guy next to him makes him too contrasting in my camera photo).

Will gladly ship the most economical way possible. USPS ground advantage in the US would run about $14 for these four I suspect.